I am looking at the header pipes on the Yamaha web site, and I can remember something about the new header pipes for the 99's that tuck out of the way may interfere with the petcock on the IMS tank. Any input will be appreciated. I'm just getting tired of loosening the stock one every time the oil is changed. Also, I am hoping I don't have to re-jet. Mine is still set up stock from the factory, Kouba installed(thanks NH Kevin) 2 1/4 turns out awesome power and snap. Thanks.